Gunfire computer



QQ l u 5 3 Pm June 28, 1960 P. H. GIROUARD GUNFIRE COMPUTER Filed June 24, 1944 FIG. 2

ET ANGlE FRENCH VERTICAL INVENTOR PHIL/AS H. GROUARD ATT ORNEY I claim: Y

1. A calculating device of the character described cornprising a chart, a linear range scale and a linear-deck armor scale thereon, said scales being graduated to advance in the sarne direction longitudinally of the chart, a series of indicia indicating the penetration resistances of variant vertical armor thicknesses at a given target angle and arranged in order of increasing magnitudes, said in dicia bein roffressivel .arranoed lonffitudinall of the D p b D b chart in `order advancing in a direction opposite said scales, a pair of longitudinally movable indicators one arranged to cooperate with said series of indicia and the other with said deck armor scale, and both with `each other, each of said indicators being arranged to cooperate with said range scale, said indicators having Warning portions which when overlapping'indicate vulnerability to both vertical and horizontal attack.

2. A calculating device of the character described comN` prising an elongate chart having a linear scale graduated in deck armor thickness and advancing in one direction therealong, a coordinate system carried by said chart and having one ordinate,representative of range, extending longitudinally of the chart parallel to and advancing in the same direction as said scale, said system having an-V other ordinate transverse to the first representative of target angle, a series of curves each representative of a different vertical armor thickness plotted on said system, each curve showing the penetration resistance of the armor represented thereby to` projectiles of a given type, said curves being progressively arranged longitudinally of the chart in order advancing in a direction opposite to said scale, a pair of indicators movable longitudinally of said chart one arranged to cooperate with said series of curves and the other With said deck Varmor scale, saiddin'- dicators including warning portions relatively'viovable into side-by-side positional correspondence indicating vulnerability to both vertical and horizontal attack,

3,. A calculating device as set forth in claim 2 in which said scale is aligned with the ran'geordinate of said system in such 'manne'rvas to indicate the penetration resistance of deck armor vof indicated VVthicknesses Vto projectiles of a given typeat the corresponding ranges.'

A calculating device as set forth in claim-2 in vvhich Y said linear scale is aligned with the range ordinate of said system in such manner as to indicate the penetration resistance of deck armor of designated thicknesses to projectiles of a given type at ranges corresponding to those 0n the range ordinate, said indicators being movable longitudinally with respect to said ordinate and one adapted to cooperate With said curves arid thevother with said scale. Y Y f 5. A calculating device as set forth in claim 2 in which said linear scale is aligned with the range ordinateof said system in such manner as to indicate the penetration resistance of deck armor of designated thicknesses to pro- VVjectiles of a given typeat ranges corresponding to those on the range ordinate,'said indicatrsrhavingY warning portions vextensible longitudinally of the chart parallel to Vsaid ordinate but from opposite ends thereof, one of said portions being adapted to cooperate with said curves and the other with said scale.

f 6. A calculating device as set forth in claim 2 in which said linear scale is aligned With the range ordinate of said system in such manner as to indicate the penetration resistance of deck armor of designated thicknesses to projectiles of a given type at ranges corresponding to those `0n the range ordinate, said indicators comprising looped References Citedin the le of 'this patent UNITED srArns rArENTs 1,608,043 vSmith l Nev. 23, 1926l V1,711,981V A Andres May 7, 1929 1,740,978 Goldsmith DAeC. 24, 1929 2,233,073 Brann .Q Q; Feb. 25, 1941 Williamson 

